ZMAN pneumatic diaphragm double-seat control valve
I. Product Overview:
The ZMAN pneumatic diaphragm double-seat control valve adopts a double-guide structure and is equipped with a multi-spring actuator. It has the advantages of compact structure, light weight, sensitive action, large valve capacity, precise flow characteristics, and easy disassembly and assembly. It is widely used in the precise control of media such as gas, liquid, and steam, keeping process parameters such as pressure, flow, temperature, and liquid level at given values. It is especially suitable for occasions with relatively large allowable pressure difference, relatively large allowable leakage, and not very clean media. This series of products has multiple varieties such as standard type, bellows seal type, and jacketed insulation type. The nominal pressure grades are PN10, 16, 40, and 64; the valve body caliber range is DN20~200. The applicable fluid temperature ranges from -200℃ to +560℃, with multiple grades within this range. The leakage standards are Class II or Class IV. The flow characteristics are linear or equal percentage. A variety of varieties and specifications are available for selection.
II. Product Features:
It consists of two parts: an electric actuator or a pneumatic actuator, and a control valve. Control valves are divided into electric control valves, pneumatic control valves, and hydraulic control valves (self-operated control valves), etc. Control valves are used to adjust the flow, pressure, and liquid level of the medium. According to the signals from the adjustment position, they automatically control the opening of the valve, thereby adjusting the flow, pressure, and liquid level of the medium. They are usually divided into two types: straight-through single-seat control valves and straight-through double-seat control valves. The latter has the characteristics of large flow capacity, small unbalance force, and stable operation, so it is usually especially suitable for occasions with large flow, high pressure drop, and small leakage. The flow capacity Cv is one of the main parameters for selecting a control valve. The flow capacity of a control valve is defined as: when the control valve is fully open, the pressure difference across the valve is 0.1MPa, and the fluid density is 1g/cm³, the flow rate passing through the control valve per hour is called the flow capacity, also known as the flow coefficient, expressed as Cv, with the unit of t/h. The Cv value of liquid is calculated according to the following formula.
| Machinery & Equipment/Valves/Control Valves | |
